Combined typing-projection system



Feb. 15, 1944.

D. F. NEWMAN COMBINED TYPING-PROJECTION SYSTEM Filed Aug. 2, 1940 3 Sheets-Sheet l INVENTOR fiamd F flewmazz BY %,Me-M

ATTO RN EYS Feb 115, 1944 D. F. NEWMAN COMBINED TYPING-PROJECTION SYSTEM Filed Aug. 2, 1940 3 Sheets-Sfieet 2 NVENTOR- Ddm'a/E/Vewman Eek 1944- D. F. NEWMAN 2341,64

COMBINED TYPING-PROJECTION SYSTEM Filed Au 2. 1940 s Sheets-Sheet s ATTORNEY6 Patented Feb. 15, 1944 UNITED STATES PATENT OFFICE CODIBINED PING-PROJECTION SYSTEM David F. Newman, Mountain Lakes, N. J., as-

Signor to Trans-Lox Corporation, New York,

N. Y., a corporation of Delaware Application August 2, 1940, Serial No. 349,648

Further in accordance with my invention, a.

typing device comprising a movable platen is utilized for typing characters in'rows transversely across a web which, after passage beyond said platen, coacts with a movable device to thereby control movement of the web through a projec tion field.

, Further in accordance with my invention, suitable means is provided between the aforesaid platen and projection field to eliminate from the web the transverse movements applied thereto by the platen whereby said web may readily be moved longitudinally through the projection field.

Various other objects, advantages and features -Fig. is a diagram illustrating the circuitcontrolling arrangement of the invention.

Referring to Figs. 1 and 2, B represents a base adapted to rest upon a floor or other suitable supporting surface. Upstanding from and suitably secured to the base B are a pair of spaced standards I, l forming a support for a structure 4 2 which comprises oppositely extending horizontal members 3 suitably secured to the respective of my invention will become apparent from the following detailed description.

My invention residesin the typing-projection system, features and arrangements of the character hereinafter described.

For an understanding of my invention and for an illustration of one of the forms thereof, reference is to be had to the accompanying drawings, in which: I

Figure 1 is a front elevational view showing a typing-projection system as constructed in accordance with my invention;

Fig. 2 is a side elevational view of the system shown in Fig. 1;

Figure 2-a is an enlarged view of a part of Figures 1 and 2;

Fig. 3 is a vertical sectional view, partly in elevation, taken on the line 3-3 of Fig. 4;

Fig. 4 is a, transverse vertical sectional view, partly in elevation, taken on the line 4-4 of Fig. 3;

Fig. 5 is a perspective view showing the circuitcontrolling arrangement and associated parts;

Fig. .6 is a transverse vertical sectional view, partly in elevation, taken. on the line 6-6 of Fig. 5;

Fig. 7 is a vertical sectional view, partly in elevation, taken on the line 'Il of Fig. 6;

Fig. 8 is a plan view, partly in section, illustrating the supply web roll and its supporting mechanism;

Fig. 9 is a transverse, vertical sectional view,

partly in elevation, taken on the line 9-9 of Fig.

8 looking in the direction of the arrows; and

standards 1. Each member 3, at its inner end, terminates in a vertical wall 4 (Fig. 4) these walls ll, 4 being spaced apart and joined by a bottom wall 5; the members 3, 3 together with the walls 4, 4 and 5 preferably being a casting forming a box-shaped structure utilizable as a lens housing as hereinafter described.

Transversely arranged with respect to the walls 4, 4 is a. front wall B, Fig. 4, which forms part of another casting I, Fig. 2, suitably secured to the casting which comprises the walls 4, 4 andi. A plate 8 may be secured to the casting I by screws 9; the plate 8 comprising an oblong aperture 8a defining the projection field of the herein described projection system.

Suitably secured, as by the screws III, to the rear end of the aforesaid casting is a lamp housing ll having afiixed to its rear wall by screws 12 or the like, a forwardly extending bracket l3 which supports a socket l4 adapted to detachably receive a projection lamp 15. This has associated with it a reflector l6 suitably secured in detachable manner to said rear wall of the lamp housing ii. For ventilating purposes, the lamp housing H may comprise a series of passages lla. through which cool air enters from the atmosphere, such air being heated by the lamp l5, thereafter passing upwardly, and then being directed forwardly by a bafile plate ll securedin suitable manner interiorly of the lamp housing H, the heated airpassing around the forward edge of the baflle plate I1 and passing to the atmosphere by way of the upper ventilating passages lib. I

' If desirable and necessary, the lamp housing H may have an additional support as provided rection from right to left, Fig. 4, through a passage l lb provided in the front lamp housing wall. Thereafter, the beam passes in succession through a pair of condenser lenses i9, 20 suitably secured in the aforesaid lens housing, and then through" the projection field defined by the aforesaid aperture 8a.

As shown in Figs. 1 and 2, there may be suitably secured to the base B a lower supporting structure 2| to which, in turn,'is secured a pair of spaced supports 22, 23 forming a horizontal supporting surface on which rests a typing device T of the character embodying a horizontally movable platen. As herein shown, although not necessarily, the typing device T is of the character known to the art as the International Business Machines electric typewriting machine.

As illustrated generally in Figs. 1 and 2, the

typing device T comprises a housing 24 in which is mounted a support for a horizontally disposed track structure 25 on which the platencarriage 26 is horizontally movable. Carried by the platen carriage 26, at the front thereof, is a platen 21 while, at the rear of the carriage, there is mounted, as hereinafter more fully described, a

. roller 28 on which is wound a web W which, with .the form of the invention herein shown, should be formed from Cellophane, glassine paper, or equivalent so as to be generally transparent or translucent. As shown. in Figs. 1 and 2, the typing device T should be so positioned that the plane of the platen 21 is parallel to the plane of the projection field. Further, with the platen 21 in its mid-position between starting and stopping positions, a vertical plane disposed'at right angles to the center of the projection field 8a should intersect the center of the platen or substantially so. 7

In accordance with the invention, the web W extends forwardly from the roller 28, beneath the platen 21 and then upwardly. aroundthe front surface thereof, said web W being suitably held in engagement with the platen 21 as known in the art. Coactable with the platen 21 to type characters in line form on the web W are the usual keys which may be operated directly by the finger members 36 or remotely by radio or a transmission line from a central station as may be desirable.

In accordance with the invention, each line of characters which is typed on the web W at the platen 21 is drawn through the projection field of the herein disclosed projector mechanism. Above said projection field there is mounted a horizontal shaft 3| which, preferably throughout the effective length thereof, carries a roller 32 (Figs.- 3 and 4), adapted for direct engagement with the web W, the aforesaid shaft 3| being actuated, as hereinafter described, to draw said web W upwardly through the projection field Disposed adjacent and above the shaft 3| is a horizontal member 33 having a plurality of weighted rollers 34 mounted loosely thereon, these rollers 34, by action of gravity, holding the web W in engagement with the roller 32.

The shaft 3| is mounted in bearings formed by upper extensions of the casting I. The member 33 is mounted in a frame 35 having, at each vertical side thereof, a pair of spaced ears 35a. These pairs of ears are adapted to interengage, respectively, with corresponding pairs of spaced ears 1a formed, respectively, at each vertical side of the aforesaid casting I. These respective sets of ears, when properly interengaged, are adapted to have screws 36 and 31 extending downwardly therethrough whereby the frame 35 is held in assembled relation with respect to-the casting I and associated parts. With an arrangement of the character described, the screw 36 may be removed when desired so that the frame 35 may threaded radially through each disk 62 and oobe swung in a pivotal manner on the axis defined by the other screw 31.

The arrangement involving the frame 35 and associated parts, as described above, is of the same general character disclosed in U. S. Letters Patent No. 2,128,867 to which reference may be had for a more detailed description thereof.

As shown in Figs. 3 and 4, a plate member 33 may be suitably secured to the casting 1 and a generally similar plate member 39 may be secured to the frame 35, these plate members, when the frame 35 is closed, being properly spaced apart so as to define a guide path for the web W after it passes beyond the drawing roller 32.

The web W, after leaving the members 33, 33, may be wound upon a roller 45 mounted in a pair of spaced bearing brackets 4| mounted in fixed position on the rear wall of the lamp housing II or otherwise as may be desirable.- As shown Fig- 3. the roller 40 comprises a shaft extension 42 to which is secured a pulley 43 disposed in alinement with a pulley 44 mounted on one end of the shaft 3|; an endless spring belt 45 or the like coacting with and engaging the two pulleys 43 and 44. The end of the shaft 3| removed from the pulley 44 has secured thereto a gear wheen 46 with which coacts a gear wheel 41 mounted on one end of a flexible shaft 48, Fig. 1, the other end of which is suitably geared to the armature of an electric motor 49 mounted in any suitable manner, for example, as shown in Fig. 1 wherein said motor 49 is supported by one of the members 3.

The plate 8 is flanged to form, preferably, a right-angle shoulder as indicated. at 8b, Figs. 3 and 4. Below this shoulder 8b, the plate 3 is suitably secured, as by the screws 50, Fig. 3, to a member 5| which extends transversely across the machine: Below the member 5|, the plate 8 extends vertically downwardly a distance which, preferably, is substantially greater than the height of the projection field 8a.

Except for the shoulder 8b, the plate 6 is of plane, flat configuration and, at its lower end, it has the spaced bearing brackets 52 secured thereto by screws 53, or equivalent. The bearing brackets 52 are disposed in horizontal alinement and they support a shaft '54 for free oscillatory movement. The opposite respective ends of the shaft 54 extend beyond the plate 8 and each end of said shaft 54 has a hanger bracket 55 secured thereto in suitable manner for oscillatory movement therewith. Thus, as shown, each hanger bracket 55 terminates in a hub section 55a, on which a collar 56 is disposed. A set screw 51 passes through each collar 56 and the associated hub section 5511; these set screws 51 engaging the shaft 54 and thereby holding the hanger brackets 55 in desired positions thereon.

The hanger brackets 55 are alined transversely of the mechanism and serve as supports for a through each collar 60 and coacts with the shaft' 54 to hold said collar 66, the member 6| and the disk 62 in adesired angular position with respect to said shaft 54. A set screw 64 is acts with the adjacent member 6| to .hold the disk a desired distance from the shaft 54. The weight arrangements comprising the disks 62 serve in an obvious manner to counterbalance the oscillatory system comprising the hanger brackets 55, the rods 58 and the slotted member 59.

Each hanger bracket 55 has secured thereto a transversely extending tubular member 65 in which is detachablyreceived the stem of a clamping ring 88. That clamping ring 86 at the right, Fig. 5, is adapted to hold a mercury switch 81 whereas that clamping ring 58 at the left, Fig. 5, is adapted to hold a mercuryswitch 61a.

The hereinbefore described plate -8 has soldered or otherwise suitably secured thereto in transverse relation a pair of vertically extending guide members 68 which, preferably, are of I curved configuration at their lower ends as indicated at 68a, Fig. 5, and which further are of reduced height or depth in the area of the projection field as indicated at 88b. The distance between these members 68 is slightly greater than the width of the web W andthey serve to guide said web toward and maintain it in the projection field 8a in the manner hereinafter described. I

As illustrated in Figs. 1 and 4, the frame 35 comprises a pair of spaced depending sections 69, 69 to each of which, preferably in adjustable manner, is secured a member 18 by the screws H, or equivalent. The members 19 are disposed in transverse alinement and they carry a pair of spaced horizontal rods l2, l3. Mounted for free pivotal movement on the rod 12 but incapable of movement longitudinally thereof are a pair of.

members 14 each of which carries an edged wheel 15 at the end thereof. Normally, the members 14 assume a position substantially as shown in Fig. 4 wherein the edged wheels i5 hold the web W in engagement with the plate 8 and apply a retarding force to said web. The rod 13, when used, extends through enlarged openings in the members 14 and maintains the latter generally in the position shown in Fig. 4, the openings, moreover, being sufficiently large so that the rod I3 does not prevent the desired movement of the wheels I5 toward the plate- 8.and into engagement with the web section im'medi ately adjacent the same.

In accordance with the invention, a member "l8, preferably of non-flexible character, is disposed above the platen 21 of the typing device T, said member 18 normally occupying a hori'- zontal position or substantially so. Preferably, the member 16 is mounted for universal movement and this may be accomplished in any suitable manner, for example, as shown in Figs. 1, 2 and 20. wherein each end of said member 18 is indicated as having a pin 1'! transversely secured thereto. Cooperative with each end of said member 18 is a block 18 having transversely.

related passages 18a and 18b which loosely receive, respectively, one end of the member 18 and the pin 11 associated therewith. Each block 'I8 has a bushing 19, or equivalent, extending therefrom and each bushing 19 is conveniently connected to one end of a suitable flexible member 89 such, for example, as a spiral spring cable. The other ends of the flexible members 88 are secured to the respective terminal members 8| which, in turn, are secured to and supported by the standards I, I respectively.

Referring particularly to Figs. 8 and 9, the platen carriage 28 is shown as carrying a transversely disposed horizontal member 82. Pivoted 83 has a member 86 slidably secured to the upper surface thereof by screws 81; the ends of these members 86 pressing downwardlyon the upper surface of the shaft 85 tothereby detachably retain the latter in its seat.

Secured to that end of the roller 28 toward the right, Fig. 8, is a disk 88 adapted to have one face of the web roll disposed thereagainst. A leaf spring 89 coacts with the disk 88 to thereby apply a retarding force to said disk as, to theroller 2a, and to the web roll rotatable therewith. The end of the spring 89 removed from the disk 88 may be anchored in position in any suitable manner as, for example, by the screws 98, Fig. 8, which secure said spring 89 to the adjacentv bracket arm 83.

Suitably secured to the exterior face of each bracket arm 83 is a member 9|. The members 9| flare outwardly, Fig. 8, and extend toward the platen carriage, each member 8| terminating in a generally 'U-shaped section 9la. These U-shaped sections 9la are coactable, respectively, with nut spective U-shaped sections 9Ia so as to prevent further pivotal movement of the bracket arms 83 in a clockwise direction (Fig. 9), beyond the position shown in that figure. However, as will be readily understood, the bracket arms 83 and all parts carried thereby may readily be swung in a counter-clockwise direction about the axis defined by the member 82. An arrangement of this character is desirable by reason of the fact that counter-clockwise swinging movement of the bracket arm assembly as described renders the underlying tabulating mechanism accessible for inspection or repair.

When it becomes necessary to dispose a new web roll on the roller 28, the members 86 may be moved backward, Fig. 8, whereby the shaft 85 may be detached from its supporting bracket arms 83. Thereupon, the new web roll may be placed in position. on the roller 28 and the shaft 85 returned to and anchored in its normal position by movement of the members 86 to the positions shown in Fig. 8.

It will be noted that the disclosed web roll supporting arrangement comprises but one of'the disks 88. During the typing operation, the platen carriage moves step-by-step from right to left,

Fig.8, and it has been ascertained that, during such movement, the web roll does not shift axially toward the right with respect to the roller 28.

However,'when the platen carriage is returned to its-initial position, the movement thereof is surden and abrupt. When this happens, if the disk 88 were not provided, the web roll would shift axially on its roller 28 in a direction toward the right, Fig. 8.

Referring to Fig. 10, the motor 49 is shown as having connected thereto a conductor which extends to one terminal of a suitable source of electrical energy (not shown), the other terminal of which has connected thereto a conductor 98. Extending from the conductor 98 to one terminal of the'mercury switch 81 is a conductor 91, and

the corresponding terminal of the mercury switch 21 is lengthened to greater extent.

61a is connected to said conductor 96 by a condoctor 98. The other terminal of the motor 49 has connected thereto a conductor 99which ex tends to and is connected to the other terminal of the mercury switch 61. Branching from the conductor 99 is a conductor I which is connected to the other terminal of the aforesaid mercury switch 61a. As shown, a resistance unit I 0|, preferably of the variable type, is included in the circuit of the conductor I00.

Normally, the web W is positioned as indicated in Fig. 2. That is, it extends from the supply roller 28 to the platen 21 of the typing device and then upwardly partly around and over the member 16. At a higher level than member-16, the web extends through the slot of the member 59 and then upwardly along the plate 8 between the guide members 68. Below the projection field 8a, the edged wheels 15 engage the web and hold the same in engagement with the plate 8 and, above edged wheels 15, the web extends through the projection field 8a above which it is engaged by the rollers'32 and 34. Beyond the rollers last named, the web passes between the plates 38 and 39 from which it extends to the roller 49.

For purposes of explanation, it may be assumed that, as shown, the web W is stationary throughout the entire length thereof from the roller 28 to the roller 40. If so, the web W is holding the member 59 in a position Where it is swung clockwise from that shown in Figs. 5 and 6 to such ex tent that the circuit through both of the mercury switches 61, 61a is open. Accordingly, under such conditions, the circuit of the motor 49 is open.

If, under the conditions recited, the typing device T is operated to efiect clockwise movement, Fig. 2, of .the platen 21, to feed the web a line space, it results that the web section beyond saidplaten 21 is lengthened whereby the member 59, under the influence of gravity in the example shown, swings counter-clockwise to some extent from the position described above and. closes the circuit of the mercury switch 61a. When this happens, a circuit is closed from one terminal of thesource of current by way of the conductors 96 and 98, the mercury switch 61a, the conductor I09 including the resistance unit Hll, conductor 99, motor 49, and thence by way of the conductor 95 back to the other terminal of said source of current.

When the motor 49 is energized, the drawing roller 32 is rotated in a clockwise direction, Fig. 4, to thereby draw the Web upwardly through the projection field, the roller 49 being simultaneously rotated in a clockwise-direction, Fig. 4, to wind thereon the web as released by the roller 32.

During this action, the edged Wheels 15 coopcrate with the plate 8 to apply a retarding force to the web whereby the web section in the projection field is maintained plane and fiat. Further, as shown in Fig. 4, the web W, just prior to the time thatit enters the projection field, is

caused to pass an-gularly across the shoulder 8b of the plate 8, this shoulder 81) serving to iron" out or eliminate web wrinkles, if present, to thereby contribute to the efficiency of the projection operation.

If, While the mercury switch 61a is closed as described above, the platen 21 of the typing device T spaces or releases the web one or more times, the web section just beyond said platen Accordingly, the member 59 swings further in a counterclockwise direction from the position first described and, in sordoing, closes the circuit of the mercury switch 61. When this happens, a circuit is closed from one terminal of the source of current by way of the conductors 96 and 91, the mercury switch 61. the conductor 99, motor 49, and thence by way of the conductor 95 back to the other terminal of said source of current. This circuit does not include the resistance unit HH and, therefore, the motor 49 operates at increased speed to draw the web through the projection field. Such increased speed of the motor 49 continues until the web becomes sufiiciently short to movethe member 59 clockwise, Figs. 5 and 6, against the force of gravity and open the circuit through the mercury switch 61. When this happens, the circuit of the motor 49 again includes the resistance unit lfll and, therefore, said motor 49 returns to its reduced speed of operation. When operation of the typing device T is discontinued, the motor 49 continues to draw the web through the projection field until the member 59 has been moved by the web clockwise, Figs. 5 and 6, to such extent that the circuits through both of the mercury switches 61 and 61a are open. When this happens, operation of the motor 49 is discontinued and movement of the web ceases.

The construction of the member 59 is a feature of the invention. The typing device T types lines of characters transversely on the web W with ink and, in order to avoid smudging of the ink, the slot 59a of the member 59 is provided. This slot is suificiently wide so that there is little or no engagement of the inked web surface with the surface defining said slot. At each side of the wide slot 59a, there are the narrower slot sections 59b through which pass the non-inked margins of the web and these web margins cooperate with the respective narrower slot sections 59b so as to move the member 59 for control purposes in the manner hereinbefore described.

As stated above, the typing device T is of the character comprising a. movable platen and, therefore, the web W moves in one direction therewith during the typing operation and then in reverse direction when the platen carriage is returned to its initial position. By reason of the fact that the web is moved in this manner by the typewriter platen and, further, by reason of the fact that the web section in the projection field should be plane, flat and without distortion, it has proved desirable in actual operation to cause the web to move over the yieldingly supported member 16, then-through the slotted member I, and then upwardly along the plate 8 between the members 68.

In view of the description hereinbefore stated, it will be understood that the web W, between the edged wheels 15 and the platen 21, is necessarily relatively taut so that movement of the member 59 by the web may be effected for the control purposes described. The flexible members 66 constantly hold the member 16 in elevated position and thereby yieldingly support the Web so that it remains taut as desired. At the same time, by reason of the fact that the members 66 are capable of universal movement, the member 16 readily moves, under control of the web, transversely of the path of web movement, as shown by the broken lines in Fig. 1, when the web is moved by the platen 21substantially to either side of its normal center position in the typing device. This is desirable because preventing damage to or undesired strain on the web. With one exception, the web remains taut at all times as stated. Should the motor 49 be operatingat fastspeed audit the web is then released one slackness may appear in the web. 1

After the web leaves the member 1.6, it passes through the slotted control member 59. This member, as stated, is freely slidable on the rods 58 and, therefore, even though the web in this position is still subjected to lateral movements in opposite directions underthe control of the that the web passes beneath the edged wheel 15,

it is moving along a longitudinal path free from lateral movements. In this condition, the web W passes subsequently through the projection field.

It will be understood that the hereinbefore described plate 8, the member 5| and the members 68 which are attached to said plate 8, may be integrally formed, if desired.

From the foregoing description, it will be under stood that the typed lines of characters pass in succession through the projection field 8a; such lines of characters being horizontally positioned while they: are in said field. At any given time, a plurality of said lines of characters are in the .projection field and the projection light beam or more times by operation of the platen 21, some said projection field after passage thereof beyond said platen, a member adapted to occupy a horizontal position or substantially so, means for sup-- 1 first with said member and then with said plate between said guide members, said web thereafter passing to and through said projection field.

passes horizontally therethrough in a direction A from right to left, Fig. 4. After passing beyond the projection field, the projecting light beam engages a mirror I02 and is deflected upwardly through an objective lens I03 from which said projecting light beam passes to any suitable mirror and screen system, not shown, whereby images of the tape characters are exhibited for visual observation.

While the invention has been described with 'respect to a certain particular preferred example which gives satisfactory results, it will be understood by those skilled in the art after understanding the invention, that various changes and modifications may be made without departing from the spirit and scope ofthe invention and it is intended therefore in the appended claims to cover all such changes and modifications.

What is claimed as new and desired to be secured by Letters Patent is:

1. In combination. a typing device comprising a platen movable back and forth along a horizontal path and carrying therewith a web on which characters are typed transversely in line formation, a projection field disposed in a vertical plane, means for drawing said web through said projection field after passage thereof beyond said platen, a plate extending substantially vertically downward from said projection field, said plate having a length substantially greater than the height of said projection field, and guide members secured in spaced relation to said plate, the web passing from said platen, into engage-' ment with said plate between said guide members and thereafter to and through said projection field.

2. In combination, a typing device comprising a platen movable back and forth along a horizontal path and carrying therewith a web on which characters are typed transversely in line formation, a projection field disposed in a vertical plane, means for drawing said web through 3. In combination, a typing device comprising a'platen movable back and forth along a horizontal path and carrying therewith a. web on which characters are typed transversely in line formation, a projection field disposed in a vertical plane, means for drawing said web through said projection field after passage thereof beyond said platen, a.v member adapted to occupy a hori zontal position or substantially so, means for supporting said member for universal movement in a restricted area, a plate extending substantially vertically downward from said projection field, said plate having a length substantially greater than the height of said projection field, guide members secured in spaced relation to said plate,

a movable device carried by the lower end of said plate, the web passing from said platen into engagement first with said member and then with said movable device to move it to different positions, said web thereafter passing into engagement with said plate between said guide members, and then passing to and through said pro- .jection field, and means controlled by said movable device for controlling said drawing means.

4. The combination with a web having transverse rows of characters thereon, a projection field, means for drawing said web through a projection field, means for applying a retarding pressure to said web prior to the time that it enters said projection field, and a member extending transversely of said web between said retarding means and the entrance side of said projection field, said member being disposedforwardly of said retarding means and the web passing from said retarding means to said member at an angle to the plane of said projection field, said member serving to iron wrinkles from the web.

5. An apparatus for a combined typing-projec:

tion system, said apparatus including in combination a number of means supporting a web for longitudinal movement, a typing device in ad- Vance of said supporting means for imprinting upon the web face transversely extending rows of characters, means disposed between certain of said web-supporting means and providing a projection field, means operative at different speeds and connected toa web-supporting means beyond said field for tensioning and drawing the web through the field, and one of said web-supporting means controlling the operation of said drawing means, said latter supporting means comprising a movable member mounted to be controlled by said web to assume-when said web is stationary and in substantially non-tensioned conditionone extreme position and to assume an opposite extreme position when said web is in a substantially'maximum condition of tension, a switch means connected to said movable member and operative to control said drawing means to function at maximum speed when said web is in such latter condition of tension, and further switch means also connected'to be operated by said movable member when the latter assumes a position intermediate its extreme positions, said further switch means being connected to cause the operation of said tensioning and drawing means at a speed less than maximum.

6. An apparatus for a combined typing-pro- Jection system, said apparatus including in combination a number of means supporting a web for longitudinal movement, a typing device in advance of said supporting means for imprinting upon the web face transversely extending rows of characters, means disposed between certain of said web-supporting means and providing a projection field, an electric motorconnected to a web-supporting means beyond said field for tensioning and drawing the web through the field, and one of said web-supporting means controlling the operation of said drawing means, said latter supporting means comprising a pivotally mounted member controlled by said web to assure-when said web is stationary and in substantially non-tensioned condition-one extreme portion and to assume an opposite extreme portion when said web is in a substantially maximum condition of tension, a switch of the type which is automatically operated according to the position which it assumes, said switch being connected to'move responsive to the degree of movement of the pivotally mounted member and also connected to said electric motor to cause the latter to operate at maximum speed when said web is in a substantially maximum condition of tension, and a further switch also connected to said pivotally mounted member and said motor to cause the latter to operate at a lesser rate of speed when said movably mounted member is in a position intermediate its extreme position.

7. An apparatus for a combined typing-projection system, said apparatus including in combination a number of means supporting a web for longitudinal movement, a typing device in ad-' vance of said supporting means for imprinting upon the web face transversely extending rows of characters, said typing device including a webengaglng platen movable to allow longitudinal movement of said web and also movable in a direction transverse of the longitudinal movement of the web and adapted to carry the web with it in such latter movement, means disposed between certain of said web-supporting means and providing a projection field, means operative at different speeds and connected to a web-supporting means beyond said field for tensioning and drawing the Web through the field, means interposed between said typing device and said field for yieldingly guiding said web in the transverse and longitudinal movements which are imparted to it by the platen of said typing device; said web in its movement beyond said last named means being substantially confined to a longitudinal movement, and one of said web-supporting means comprising a movable member mounted to be controlled by said web to assume-when said web is stationary and in substantially non-tensioned condition-one extreme position and to assume an opposite extreme positionwhen said web is in a substantially maximum condition of tension, a switch means connected to said movable member and operative to control said drawing means to function at maximum speed when said web is in such latter condition of tension, and further switch means also connected to be operated by said movable member when the latter assumes a position intermediate its extreme positions, said 

